yes, there can be only one file with the name...they'd have to re-add theirs...same with the bookmarks file, though the bookmarks are in a simple HTML file and you can have 27 different sets if you wish, as long as you open them with the 'file/open' menu....

but you 'could' re-name the .dat file and keep track of which one you were using...but it would be esier to just re-type a few filters.